Continuously loaded telegraph cable



' March 14, 1933. J. R. VEZEY CONTINUOUSLY LOADED TELEGRAPH CABLE FiledAug. 22, 1930 INVENTOR JOH N R. VEZEY gawk ATTORbTE Z Patented Mar. 14,1933 unrrsn STATES JOHN RIGKETTS VEZEY, OF LONDON, E

STANDARD ELECTRIC CORPORATION, DELAWARE coNrrINUousLY LOADED TELEGRAPHCABLE Application filed August 22, 1930, Serial No. 477,149, and inGreat Britain September 18,1929.

This invention relates to loading systems for submarine cables andisparticularly applicable to telegraph cables.

In existing telegraph cables of the deep sea type with the employment ofhigh permeability material for continuously loading the cableconductors, it has been possible to work simplex successfully atreasonable speeds but up to the present satisfactory duplex working wasdifficult to attain due mainly to the difliculties of designlng anartificial line having the characteristics of the cable.

The present invention provides a cable loading system which has manyadvantages over existing types and which may be more readily balanced orsimulated by an artificial line.

A method of loading systems is disclosed in British Patent 201,931 of1923 in which Figs. 4 and 5 show forms of loading by applying a helicaltape of permalloy to the conductor. This form of loading may be appliedin the present instance.

Broadly the invention comprises a submarine cable for alternate loadedsections and non-loaded sections as shown in the drawing wherein theloading decreases from the centre of the cable towards the ends byvarying uniformly the length of either or both sections. In thepreferred embodiment, the cable comprises alternate sections of twodifferent types, in one type the conductors being continuously loadedwith a high permeability material and the other type bein loadedsections occupy a certain proportion of the length of the cable and fromthis point advancing to each end, the proportion of the loaded sectionsto the non-loaded sections is gradually decreased. My invention isillustrated in Figs. 1, 2 and 3 wherein, various modifications areshown.

In one embodiment of the invention as shown in Fig. 1, the loadedsections are of substantially uniform length, but the interval betweenthe loaded sections being gradually increased from the centre towardsthe ends of the cable.

In another embodiment as shown in Fig.

The determination the 'diflerent sections used throughout the V thelength ofthe cable .and upon'the degree of uniformity desired, f

.manufacturing lengths of "U in the various figures.

By following the above particulars it is possible to obtain acablewherein the change of inductance from one end to the other is verygradual throughout, the loading gradually increasing from one end ofthecable to the centre and decreasing from the centre to the other endof the cable.

of the exact lengths of cable depends upon havingregard to the expenseof manufacture. It would be convenient, for example,to choose for theloaded sectionsa standard manufacturing length and to choose theintermediate sections of non-loaded cable to be multiples-.or-sub-multiples of ajmanufacturing length of non loaded cable. Thus,

for example, the centre of a cable may be comprised by single loadedcable al- NGLANDQ assIeNon TO INTERNATIONAL a or nw jYoRx, N. Y., ACORPORATION or both the length of ternating with sections of non-loadedcablev g .whose'lengths are two manufacturing units non-loaded. At thecentre of the cable the or lengths. Further from'the it centre vof-thecable the latter may be comprised by sections of loaded cable of thesame length as before alternating with sections of whose lengths wouldbe four manufacturing units, this gradation could be continued to r theends of the cable which would'be preferably non-loaded. 7

Since the particular choice of gradingwould depend'largely uponcommercial considerations, in some cases'it may be desirable to vary theloaded sections in lengths gradually decreasing towards the end of thecable non-loaded,cable I and with such an arrangement either to keep.

the non-loaded sections constant or to vary them also in accordance withthe above principles.

What is claimed is: V

1. A submarine cable comprising alternate loaded sections and unloadedsections, the length of which are varied in such manner that the loadingdecreases from the center of the cable toward the end.

2. A submarine cable comprising alternate loaded sections and'unloadedsections wherein the length of the unloaded sections is graduallyincreased toward the ends of the cable whereby the loading is graduallydecreased.

3. A submarine cable as claimed in claim 2 wherein a graduation inloading is efli'ected by. decreasing the length of the loaded sectionsfrom the center of the cable toward the ends;

4. A submarine cable comprising a plurality of loaded sections and aplurality of unloaded sections, wherein one loaded section is joined toanother. loaded section by one of the unloaded sections, and the lengthof loaded sections is progressively less toward the end of the cable.

5. A submarine cable comprising a plurality of loaded sections and aplurality of unloaded sections, wherein the length of loaded sections isprogressively less toward the'end of the cable and the length of non--loaded sections is constant. 6. A submarine cable comprising apluralityof loaded sections and a' plurality of unloaded sections,wherein the length of loaded sections remains constant and the length ofunloaded sections is progressively greater toward theend.

7. A submarine cable comprising a plurality of loaded sections and aplurality of unloaded sections, wherein the length of loaded sections isprogressively less toward the end and the length of unloaded sections isprogressively greater toward the end.

8. A submarine cablecomprising a plurality of loaded sections andaplurality of unloaded sections, whereinboth the length of loaded andunloaded sections are progressive- 131 less toward the end.

In witness whereof,

J OHNY RICKETTS VEZEY.

'I hereunto subscribe 7 -my name this 18 day of July, 1930.

